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INCOME TAXES (Tables) | 12 Months Ended
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Dec. 31, 2012
INCOME TAXES |
Schedule of income tax expense on income from continuing operations | The income tax expense on income from continuing operations for each of the three years in the period ended December 31, 2012 consisted of the following (in millions):
|  | 2012 |  | 2011 |  | 2010 |
Current: |  |  |  |  |  |  |
Federal |  | $ | 38.9 |  | $ | 26.5 |  | $ | 38.1 |
State |  | 3.2 |  | 1.8 |  | 5.4 |
Total |  | 42.1 |  | 28.3 |  | 43.5 |
Deferred |  | (9.1 | ) | (3.2 | ) | 3.2 |
Provision for income taxes |  | $ | 33.0 |  | $ | 25.1 |  | $ | 46.7 |
Schedule of reasons why income tax expense differs from amounts computed by applying the statutory federal rate to income from continuing operations | Income tax expense for 2012, 2011, and 2010 differs from amounts computed by applying the statutory federal rate to income from continuing operations before income taxes for the following reasons (in millions):
|  | 2012 |  | 2011 |  | 2010 |
Computed federal income tax expense |  | $ | 29.7 |  | $ | 24.9 |  | $ | 41.2 |
State income taxes |  | 0.5 |  | 1.4 |  | 5.0 |
Deferred tax adjustment |  | (1.4 | ) | — |  | — |
Separation costs |  | 1.7 |  | — |  | — |
Unrecognized tax benefit |  | 1.5 |  | — |  | — |
Other — net |  | 1.0 |  | (1.2 | ) | 0.5 |
Provision for income taxes |  | $ | 33.0 |  | $ | 25.1 |  | $ | 46.7 |
Schedule of tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities | The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities at December 31 of each year are as follows (in millions):
|  | 2012 |  | 2011 |
Deferred tax assets: |  |  |  |  |
Benefit plans |  | $ | 54.0 |  | $ | 52.5 |
Insurance reserves |  | 9.7 |  | 7.8 |
Allowance for doubtful accounts |  | 1.7 |  | 1.9 |
Reserves |  | 1.7 |  | 2.5 |
Other |  | 0.3 |  | 1.9 |
Total deferred tax assets |  | 67.4 |  | 66.6 |
Deferred tax liabilities: |  |  |  |  |
Basis differences for property and equipment |  | 292.6 |  | 301.1 |
Capital Construction Fund |  | 3.3 |  | 3.3 |
Joint ventures and other investments |  | 3.8 |  | 6.0 |
Deferred revenue |  | 10.9 |  | 8.0 |
Amortization |  | 2.1 |  | 2.0 |
Total deferred tax liabilities |  | 312.7 |  | 320.4 |
Net deferred tax liability |  | $ | 245.3 |  | $ | 253.8 |
Reconciliation of unrecognized tax benefits | A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in millions):
Balance at December 31, 2009 |  | $ | 2.7 |
Additions for tax positions of prior years |  | — |
Additions for tax positions of current year |  | 1.1 |
Reductions for tax positions of prior years |  | (0.3 | )
Reductions for lapse of statute of limitations |  | — |
Balance at December 31, 2010 |  | 3.5 |
Additions for tax positions of prior years |  | 0.3 |
Reductions for tax positions of current year |  | (0.5 | )
Reductions for tax positions of prior years |  | — |
Reductions for lapse of statute of limitations |  | (0.7 | )
Balance at December 31, 2011 |  | 2.6 |
Additions for tax positions of prior years |  | 4.0 |
Additions for tax positions of current year |  | 3.7 |
Reductions for tax positions of prior years |  | (1.0 | )
Reductions for lapse of statute of limitations |  | (1.0 | )
Balance at December 31, 2012 |  | $ | 8.3 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=21917533&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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